GHM G 1420 Owner's manual

GHM
Brand
GHM
Model
G 1420
Category
Measuring, testing & control
Type
Owner's manual

This manual is also suitable for

Quick reference guide
G 1400 series
Handheld Conductivity Meter
/ EC-Meter
EN
Table of contents G 1400 series
2 / 22 B-H87.0.0X.DK2-3.0
Table of contents
1 About this documentation ...................................................... 4
1.1 Foreword ........................................................................................ 4
1.2 Legal notices .................................................................................. 4
1.3 Further information ......................................................................... 4
2 Safety ....................................................................................... 5
2.1 Explanation of safety symbols ........................................................ 5
2.2 Foreseeable misuse ....................................................................... 5
2.3 Safety instructions .......................................................................... 6
2.4 Intended use ................................................................................... 6
2.5 Qualified personnel ......................................................................... 6
3 The device at a glance ............................................................ 7
3.1 Display elements ............................................................................ 7
3.2 Operating elements ........................................................................ 8
4 Operation ................................................................................. 9
4.1 Opening the configuration menu ..................................................... 9
4.2 Adjustment of the measuring input ................................................ 11
5 Measurement Basics ............................................................. 12
5.1 Conductivity principles .................................................................. 12
5.2 General information about conductivity measuring ........................ 12
5.2.1 General Design Electrodes / Measuring cell ................................. 13
5.2.2 Calibration / adjustment of the measuring cell ............................... 13
5.3 Total dissolved solids / TDS measurement ................................... 13
5.4 Salt content / salinity measurement .............................................. 14
5.5 Temperature compensation .......................................................... 15
5.5.1 NLF temperature compensation according to EN 27888 ............... 15
5.5.2 Linear temperature compensation LIN .......................................... 15
5.5.3 Compensation of weak NaCl solutions .......................................... 15
G 1400 series Table of contents
B-H87.0.0X.DK2-3.0 3 / 22
6 Operation and maintenance ................................................. 16
6.1 Operating and maintenance notices.............................................. 16
6.2 Battery .......................................................................................... 16
6.2.1 Battery indicator............................................................................ 16
6.2.2 Changing battery .......................................................................... 16
7 Error and system messages ................................................. 18
8 Technical data ....................................................................... 19
9 Disposal ................................................................................. 22
10 Service ................................................................................... 22
10.1 Manufacturer ................................................................................ 22
1 | About this documentation G 1400 series
4 / 22 B-H87.0.0X.DK2-3.0
1 About this documentation
1.1 Foreword
_
Read this document carefully and familiarise yourself with the operation of the device
before you use it.
Keep this document ready to hand and in the immediate vicinity of the device so that it
is available to the personnel/user for reference at all times in case of doubt.
The user must have carefully read and understood the operating manual before
beginning any work.
1.2 Legal notices
The liability and warranty of the manufacturer for damages and consequential
damages are voided with misuse, disregarding this document, disregarding safety
notices, assignment of inadequately qualified technical personnel and arbitrary
modifications of the device.
This document is entrusted to the recipient for personal use only. Any impermissible
transfer, duplication, translation into other languages or excerpts from this operating
manual are prohibited.
The manufacturer assumes no liability for print errors.
1.3 Further information
_
Software version of the device:
– V1.5 or later
For the exact product name, refer to the type plate on the rear side of the device.
_
NOTE
For information about the software version, press and hold the ON button to switch on
the device for longer than 5 seconds. The series is shown in the main display and the
software version of the device is shown in the secondary display.
G 1400 series Safety | 2
B-H87.0.0X.DK2-3.0 5 / 22
2 Safety
2.1 Explanation of safety symbols
_
DANGER
This symbol warns of imminent danger, which can result in death, severe bodily injury,
or severe property damage in case of non-observance.
_
CAUTION
This symbol warns of potential dangers or harmful situations, which can cause damage
to the device or to the environment in case of non-observance.
_
NOTE
This symbol indicates processes, which can have a direct influence on operation or
can trigger an unforeseen reaction in case of non-observance.
2.2 Foreseeable misuse
_
The fault-free function and operational safety of the device can only be guaranteed if
applicable safety precautions and the device-specific safety instructions for this
document are observed.
If these notices are disregarded, personal injury or death, as well as property damage
can occur.
_
DANGER
Incorrect area of application!
In order to prevent erratic behaviour of the device, personal injury or property damage,
the device must be used exclusively as described under intended use.
– Do not use in safety / Emergency Stop devices!
– The device is not suitable for use in explosion-prone areas!
– The device must not be used for diagnostic or other medical purposes on
patients!
– The pro device duct is not intended to come into direct contact with food. For
measurement in foods, samples must be taken and discarded after the
measurement!
– Not suitable for use with requirements on functional safety, e.g. SIL!
2 | Safety G 1400 series
6 / 22 B-H87.0.0X.DK2-3.0
2.3 Safety instructions
_
CAUTION
Measuring cell must never come into contact with water-repellent materials such as oil
or silicone.
CAUTION
Empty batteries and batteries of inferior quality can leak more easily, which can
destroy the device. Please also observe the instructions in the chapter “Operation and
maintenance”.
NOTE
This device does not belong in children's hands!
2.4 Intended use
_
The device is designed for measuring the conductivity in liquids.
The measuring cell is connected permanently.
The range of application depends on the different measuring cells of the type:
G 1409
G 1410
G 1420
2.5 Qualified personnel
For commissioning, operation and maintenance, the relevant personnel must have
adequate knowledge of the measuring process and the significance of the
measurements. The instructions in this document must be understood, observed and
followed.
In order to avoid any risks arising from interpretation of the measurements in the
concrete application, the user must have additional expertise. The user is solely liable
for damages/danger resulting from misinterpretation due to inadequate expertise.
G 1400 series The device at a glance | 3
B-H87.0.0X.DK2-3.0 7 / 22
3 The device at a glance
LCD Display
Front view
3.1 Display elements
_
Display
_
Battery indicator
Evaluation of the battery status
_
Unit display
Display of units or type of mode, min/max/hold
_
Main display
Measurement of the current conductivity value or
value for min/max/hold
_
Auxiliary display
Corresponding temperature value for the value
shown in the main display. If applicable, alternating
with the temperature compensation.
3 | The device at a glance G 1400 series
8 / 22 B-H87.0.0X.DK2-3.0
3.2 Operating elements
_
On / Off button
Press briefly
Switch on the device
Activate / deactivate lighting
Long press
Switch off the device
Reject changes in a menu
_
Up / Down button
Press briefly
Display of the min/max value
Change value of the selected parameter
Long press
Reset the min/max value of the current
measurement
Both simultaneously
Rotate display, overhead display
_
Function button
Press briefly
Freeze measurement (Hold)
Call up next parameter
Long press, 2s
Start menu “configuration”, (ONF appears in the
display
Operating status device is in measured value display
device is in a menu
G 1400 series Operation | 4
B-H87.0.0X.DK2-3.0 9 / 22
4 Operation
4.1 Opening the configuration menu
1. Press the Function key for 2 seconds to open the Configuration menu.
2. (ONF appears in the display. Release the Function key.
_
Parameter
Values
Meaning
__INP
Measuring unit
(OND
conductivity
RES,
specific resistance (G 1420 only)
E(
EC (~ mS/cm) (G 1409 only)
(F
CF (~ 10 x EC) (G 1409 only)
SAL
salt content / salinity (G 1410 only)
TDS
total dissolved solids (G 1409, G 1410 only)
__ CTDS
Factor for TDS (G 1410 and G 1409 only)
0.40 .. 1.00
Conversion factor for TDS measurement
commonly used: 0.500 or 0.700
__ TCOR
Temperature compensation
OFF
Do not compensate conductivity measurement
NLF
Non-linear function for natural water in accordance
with EN 27888 (ISO 7888) Ground water, surface
water or drinking water
NACI
Compensation of weak NaCI solutions only in pure
and ultrapure water (G 1420 only)
L,N
Linear temperature compensation (G 1420 only)
4 | Operation G 1400 series
10 / 22 B-H87.0.0X.DK2-3.0
__ TL,N
Compensation coefficient (G 1420 only)
0.300 .. 3.000
Temperature compensation coefficient in %/K
_ TREF
Reference temperature for temperature compensation
25 °(
Reference temperature 25 °C or 77 °F
20 °(
Reference temperature 20 °C or 68 °F
POFF
Shut-off time
OFF
No automatic shut-off
15, 30, 60, 120, 240
Automatic shut-off after a selected time in minutes,
during which no buttons have been pressed
L,TE
Backlight
OFF
Backlight deactivated
15, 30, 60, 120, 240
Automatic shut-off of the backlight after a selected
time in seconds, during which no buttons have
been pressed
ON
No automatic shut off of the backlight
UN,T
Temperature display unit
°(
Temperature display in °C
°F
Temperature display in °F
IN,T
Factory settings
NO
Use current configuration
YES
Reset device to factory settings.
After confirming with the function-button, the display
shows: IN,T DONE
_
_
G 1400 series Operation | 4
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4.2 Adjustment of the measuring input
With the conductivity slope correction, the conductivity value can be readjusted.
The temperature input can be adjusted with the zero point correction and the gradient
correction. If an adjustment is made, you change the pre-adjusted factory settings.
This is signalled with the display text T.OF, T.SL or S(L when switching on.
1. Switch the device off.
2. Hold the down button and press the On/Off button briefly to switch on the device
and open the Adjustment menu.
3. The display shows the first parameter. Release the down button.
Parameter
Values
Meaning
_T.OF
Zero point correction of the temperature
0.00
No zero point correction
-5.00 … 5.00
Zero point correction in °C. (at °F -9.00 .. +9.00)
_T.SL
Gradient correction of the temperature
0.00
No gradient correction
-5.00 … 5.00
Gradient correction in %
_S(L
Gradient correction for the conductivity value
1.000
No gradient correction
0.800 … 1.200
Multiplier for the gradient correction
Formula used by device:
Temperature = °C: Display = (measured value - T.OF) * (1 + T.SL / 100)
Temperature = °F: Display = (meas. value - 32 °F - T.OF) * (1 + T.SL / 100) + 32 °F
Gradient correction conductivity.: Displayed value = measured value / S(L
5 | Measurement Basics G 1400 series
12 / 22 B-H87.0.0X.DK2-3.0
5 Measurement Basics
5.1 Conductivity principles
Conductivity γ
Conductivity describes the capability of a material to conduct electrical current. It is
also the inverse of specific resistance. The conductance is the inverse of the measured
resistance R.
Formula: γ = l / (R*A)
l = length of the material
A = cross section
R = measured resistance
Unit [γ] = Siemens / metre = S / m
Normally, the values for liquids are specified in µS/cm or in mS/cm
5.2 General information about conductivity measuring
During the measurement, the conductivity measuring cell must be dipped at least in so
far, that at least 30 mm (G 1420: 25 mm) beginning from the top of the measuring cell,
is located in the medium. The maximum immersion depth for continuous operation
should not exceed 110 mm (G 1420: 70 mm)
Illustration: Measuring cell G 1410
The measuring cell can either be stored dry or in water. After dry storage wetting time
will be prolonged slightly. If changing over from one liquid to another with conductivities
varying widely make sure to properly rinse and shake dry measuring cell.
If conductivity measured is much higher or lower than expected this may be due to the
electrode being soiled with non-conducting or conducting foreign materials. Measuring
cell has to be cleaned with a watery soap solution. When measuring media with low
conductivities the electrode has to be stirred sufficiently.
CAUTION
Measuring cell must never come into contact with water-repellent materials such as oil
or silicone.
Recommended immersion depth
G 1400 series Measurement Basics | 5
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5.2.1 General Design Electrodes / Measuring cell
_
There are basically two different types of measuring cells: 2-pole and 4-pole measuring
cells.
Control and/or evaluation take place in a similar manner; the 4-pole measuring cells
can compensate well for polarisation effects and contamination to a certain degree
with the more elaborate measuring processes.
2-pole measuring cell
4-pole measuring cell
The device series is equipped with a permanently connected 2-pole measuring cell.
5.2.2 Calibration / adjustment of the measuring cell
_
NOTE
In harsh applications and due to ageing processes, the cell constant of measuring cells
changes, which leads to incorrect measured values.
Depending on the application and precision requirement, the overall precision of the
display device and measuring cell measuring chain should be checked regularly.
Special testing and calibration solutions, such as GKL 100, 101 and 102 are available
for this purpose.
In normal application conditions, semi-annual testing is recommended – please refer
to 4.2 “Adjustment of the measuring input“.
5.3 Total dissolved solids / TDS measurement (only available at
G 1409 and G 1410)
The total dissolved solids measurement - TDS measurement - determines the total
dissolved solids, which also called evaporation residue, based on the conductivity and
a conversion factor CtdS of the total dissolved solids. Well-suited to conduct simple
concentration measurements of salt solutions. The display shows mg/l.
Display value TDS = conductivity [in µs/cm, with nLF = 25°C] * CtdS
5 | Measurement Basics G 1400 series
14 / 22 B-H87.0.0X.DK2-3.0
With selection of TDS, the necessary temperature compensation is selected
automatically. Menu settings for temperature compensation are ignored.
The following approximations apply:
CtdS
0,50
Monovalent salts with 2 ion types = NaCl, KCl or similar
0,50
Natural water of surface water, drinking water
0,65 bis 0,70
Salt concentration of aqueous fertiliser solutions
NOTE
These are guideline values for estimates, but are not suitable for precise
measurements. The conversion factor for the respective type of solution and the
examined concentration range must be determined for precise measurements. This
can take place with calibration to known comparison solutions or with actual
evaporation of a certain amount of liquid with measured conductivity and subsequent
weight of the total dissolved solids.
5.4 Salt content / salinity measurement (only available at G 1410)
In SAL measuring mode, the salinity, which is the salt content of sea water, is
determined. The basis for this is the International Oceanographic Tables, IOT.
Standard salt water has a salinity of 35 ‰, 35 g of salt per 1 kg of sea water. The
display in % [g/kg] normally does not show units. The designation PSU, Practical
Salinity Unit, is also commonly used; the display value is identical. The salinity
measurement has temperature compensation, which means the temperature is
considered for the display and has a major influence on the display value; any menu
settings regarding temperature compensation are ignored.
NOTE
The salt composition of different seas is not identical. Depending on the location,
weather, seasons, etc., there are considerable deviations from the 35 ‰ according to
the IOT. The salt composition can also influence the relationship of the salinity display
and the actual amount of salt present.
Corresponding tables are available for many salts in salt water aquarium applications.
Salt weight to salinity according to the IOT or conductivity. In consideration of these
tables, very precise salinity measurements can be conducted.
G 1400 series Measurement Basics | 5
B-H87.0.0X.DK2-3.0 15 / 22
5.5 Temperature compensation
The conductivity of aqueous solutions is temperature-dependent. The temperature
dependency varies greatly according to the type of solution. With temperature
compensation, the solution is calculated back to a uniform temperature in order to
compare it independently of the temperature. The normal operating temperature for
this is 25 °C. However, it can also be adjusted to 20 °C.
5.5.1 NLF temperature compensation according to EN 27888
For most applications, such as fish husbandry applications and measurement of
surface water and drinking water, non-linear temperature compensation for natural
water NLF is sufficiently accurate in accordance with EN 27888.
The normal operating temperature is 25 °C.
The recommended application range of NLF compensation is between 60 μS/cm and
1000 μS/cm.
5.5.2 Linear temperature compensation LIN (only available at G 1420)
If the function of the temperature compensation is not known exactly, a linear
temperature compensation is normally adjusted in the device.
Open the Configuration menu and select the parameter TCOR. Configuration parameter
LIN and TLIN correspond to TKlin.
Put simply, this means that the temperature dependency is approximately the same
over the considered concentration range of the solution.
Temperature coefficients of 2,0 %/K are most common.
Formula LFTref = LFTX / ((1 + TKlin / 100%) * (TX - Tref))
A temperature coefficient can be determined, for example, with measurement of a
solution at 2 temperatures, T1 and T2, with temperature compensation switched off.
Formula TKlin = ((LFT1 - LFT2) * 100%) / ((T1 – T2) * LFT1)
TKlin = value is entered in the Configuration menu in parameter TLIN.
LFT1 = conductivity at temperature 1
LFT2 = conductivity at temperature 2
5.5.3 Compensation of weak NaCl solutions (only available at G 1420)
Compensation of weak NaCI according to EN 60746-3 solutions in pure and ultrapure
water
6 | Operation and maintenance G 1400 series
16 / 22 B-H87.0.0X.DK2-3.0
6 Operation and maintenance
6.1 Operating and maintenance notices
_
NOTE
The device and conductivity measuring cell must be handled with care and used in
accordance with the technical data. Do not throw or strike.
_
NOTE
If the device is stored at a temperature above 50 °C, or is not used for an extended
period of time, the batteries must be removed. Leaks from the batteries are avoided as
a result.
_
The device is calibrated at the factory with the permanently connected conductivity
measuring cell. The highest system precision can be achieved in this manner. If
desired, a gradient correction can be carried out for the device in order to further
optimise the accuracy in a narrow range. This is only necessary for normal use. See
Adjustment of the measuring input.
6.2 Battery
6.2.1 Battery indicator
_
If the empty frame in the battery display blinks, the batteries are depleted and must be
replaced. However, the device will still operate for a certain length of time.
If the BAT display text appears in the main display, the battery voltage is no longer
adequate for operation of the device. The battery is fully depleted.
6.2.2 Changing battery
_
DANGER
Danger of explosion!
Using damaged or unsuitable batteries can generate heat, which can cause the batter-
ies to crack and possibly explode!
– Only use high-quality and suitable alkaline batteries!
_
G 1400 series Operation and maintenance | 6
B-H87.0.0X.DK2-3.0 17 / 22
CAUTION
Damage!
If the batteries have different charge levels, leaks and thus damage to the device can
occur.
– Only use high-quality and suitable alkaline batteries!
– Do not use different types of batteries!
– Remove depleted batteries immediately and dispose of them at a suitable
collection point.
_
NOTE
Unnecessary unscrewing endangers the protection against moisture and should
therefore be avoided.
NOTE
Read the following handling instructions before replacing batteries and follow them
step by step.
If disregarded, the device could be damaged or the protection from moisture could be
diminished.
1. Unscrews the Phillips screws (A)and remove the cover.
2. Carefully replace the two Mignon AA batteries (B).
Ensure that the polarity is correct! It must be possible to
insert the batteries in the correct position without using
force.
3. The O-ring (C) must be undamaged, clean and
positioned at the intended depth.
4. Fit the cover (D) on evenly. The O-ring must remain at
the intended depth!
5. Tighten the Phillips screws (A).
7 | Error and system messages G 1400 series
18 / 22 B-H87.0.0X.DK2-3.0
7 Error and system messages
Display
Meaning
Possible causes
Remedy
----
Range switches or
measured value
unstable
Impurities or air
bubbles
Measured value far
outside of the
measuring range
Controlling instable
Contamination or air
bubbles on cell
Measurement outside
permissible range
Measuring cell defect
Wait for the transient
effect of the controller
clean contamination /
bubbles
Keep measurement within
the permissible range
Send in for repair
SENS ERRO
Sensor cable
defect
Sensor or probe
defect
Measuring range
exceeded/undercut
Cable breakage
Sensor or probe
defect
Measurement outside
permissible range
Send in for repair
Send in for repair
Stay within allowable
measurement range
No display,
unclear characters
or no response
when buttons are
pressed
Battery depleted
System error
Device is defective
Battery depleted
Error in the device
Replace battery
Send in for repair
BAT
Battery depleted
Battery depleted
Replace battery
ERR.1
Measuring range
exceeded
Measurement too high
Measuring cell defect
Stay within allowable
measurement range
Check the measuring cell
/ send in for repair
ERR.2
Measuring range is
undercut
Measurement too low
Measuring cell defect
Stay within allowable
measurement range
Check the measuring cell
/ send in for repair
SYS ERR
System error
Error in the device
Switch device on/off
Replace batteries
Send in for repair
G 1400 series Technical data | 8
B-H87.0.0X.DK2-3.0 19 / 22
8 Technical data
_
_
G 1409
Measuring
range
Conductivity
0 .. 5000 µS/cm
Spec. resistance
-
EC
0 .. 5,000 EC (corresponds to m/cm)
CF
0,00 .. 50,00 CF (corresponds to 10 x EC)
Salinity
-
TDS
0 .. 2000 mg/l
Temperature
-5,0 .. +80,0 °C (23,0 .. +176,0 °F).
Accuracy
Conductivity
typ. ± 1 % of measured value ± 0,5 % FS
(0 .. 2000 µS/cm)
Temperature
± 0,3 °C
G 1410
Measuring
range
Conductivity
0 .. 2000 µS/cm
0.00 .. 20.00 mS/cm
0.0 .. 100.0 mS/cm
Spec. resistance
-
EC
-
CF
-
Salinity
0.0 .. 50.0 g/kg
TDS
0 .. 2000 mg/l
Temperature
-5.0 .. +105.0 °C (23.0 .. +221.0 °F)
Note: the conductivity measuring cells can be exposed
temporarily to temperatures of up to 100 °C and
permanently to temperatures of up to 80 °C.
Accuracy
Conductivity
± 0.5 % of measured value ± 0.5 % FS
Temperature
± 0.3 °C
8 | Technical data G 1400 series
20 / 22 B-H87.0.0X.DK2-3.0
G 1420
Measuring
range
Conductivity
0.000 .. 2.000 µS/cm
0.00 .. 20.00 µS/cm
0.0 .. 100.0 µS/cm
Specific
resistance
10.0 .. 200.0 kΩ/cm
0.010 .. 2.000 MΩ/cm
0.01 .. 20.00 MΩ/cm
EC
-
CF
-
Salinity
-
TDS
-
Temperature
-5.0 .. +105.0 °C (23.0 .. +221.0 °F)
Note: the conductivity measuring cells can be exposed
temporarily to temperatures of up to 100 °C and
permanently to temperatures of up to 80 °C.
Accuracy
Conductivity
Typ. ± 1 % of measured value ± 0.5 % FS
Temperature
± 0.3 °C
Measuring cell
G 1409
G 1410
G 1420
Electrodes
titanium
graphite
stainless steel
Shaft
plastic,
Ø12 x 120 mm
PPO (Noryl),
Ø12 x 120 mm
stainless steel;
Ø12 x 75 mm
Wetted parts
Titan,
plastic,
graphite,
PPO (Noryl),
st. steel 1.4435
stainless steel
(1.4404, 1.4435),
PEEK
Pressure resistance
1 bar
6 bar (@ 25°C)
1 bar
Dimensions
(without cable)
Ø16 x 155 mm
Ø16.8 x 160 mm
~Ø20 x 195 mm
Measuring cycle
approx. 10 measurements per second
(Updating of the display approx. 2 times per second)
Display
3- line segment LCD, additional symbols, illuminated
(adjustable white, permanent illumination)
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GHM G 1420 Owner's manual

GHM
Brand
GHM
Model
G 1420
Category
Measuring, testing & control
Type
Owner's manual
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